Military Tactical backpack size approx.: 20*30*15CM (W*H*D),Military backpack is made of high density fabric--durable and water-resistant Webbing throughout for attaching additional tactical pouches or gear as 3 day assault pack backpack combat backpack. Assault pack backpack with double-stitched, Heavy duty zippers and utility-style cord pulls, Side and front load compression system, Ventilated mesh padded back area & shoulder strap,breathable and comfortable. Military backpack has hydration compatible that works great for a hydration bladder (backpack didn't include hydration bladder) as hydration backpack or outdoor camping hiking backpack. Tactical assault pack backpack can be used as 3 day assault pack, range bag, hunting backpack, survival backpack, army backpack, trekking backpack or day pack for daily use